I think there should have been more scenes with Noah to truly “earn” this speech. We haven’t gotten his full perspective on his changes and he was acting upbeat during the date in spite of the obvious problems he was having. I hope it at least doesn’t come totally out of left field to readers.

The blanket isn’t very effective on Noah, being cold-blooded. Flint doesn’t know that. He’s just trying to help. Noah is tactfully not mentioning that he barely generates internal body heat anymore.